I play football and every time I go to hit someone before I do I freeze or just stop and basically they run over me and because of that it's keeping me of my full potential i don't know if I'm scared to get hurt or whatever but do you guys have any suggestions on how to stop being afraid to hit or get hurt

Try going for their legs or maybe try playing a different position. If you get scared to tackle someone in a real game as a linebacker then you are screwed. A linebackers main job is to cover and tackle. You can't not do 1 of them.